public static string PosixIsSwappingOnHddInsteadOfSsd()
{
{
var path = KernelVirtualFileSystemUtils.ReadSwapInformationFromSwapsFile();
if (path == null) // on error return as if no swap problem
{
return(null);
}
string foundRotationalDiskDrive = null;
foreach (string partition in path)
{
// remove numbers at end of string (i.e.: /dev/sda5 ==> sda)
var reg = new System.Text.RegularExpressions.Regex(@"\d+$"); // we do not check swap file, only partitions
var disk = reg.Replace(partition, "").Replace("/dev/", "");
var filename = $"/sys/block/{disk}/queue/rotational";
var isHdd = KernelVirtualFileSystemUtils.ReadNumberFromFile(filename);
if (isHdd == -1)
{
return(null);
}
if (isHdd == 1)
{
foundRotationalDiskDrive = filename;
}
else if (isHdd != 0)
{
if (Log.IsOperationsEnabled)
{
Log.Operations($"Got invalid value (not 0 or 1) from {filename} = {isHdd}, assumes this is not a rotational disk");
}
foundRotationalDiskDrive = null;
}
}
string hddSwapsInsteadOfSsd = null;
if (foundRotationalDiskDrive != null)
{
// search if ssd drive is available
HashSet <string> disks = KernelVirtualFileSystemUtils.GetAllDisksFromPartitionsFile();
foreach (var disk in disks)
{
var filename = $"/sys/block/{disk}/queue/rotational";
var isHdd = KernelVirtualFileSystemUtils.ReadNumberFromFile(filename);
if (isHdd == 0)
{
hddSwapsInsteadOfSsd = disk;
break;
}
}
}
return(hddSwapsInsteadOfSsd);
}
}
public void WriteAndReadPageUsingCryptoPager_WhenTwoSwapDefined_AllResultShouldBeNotNull()
{
var fileName = GetTempFileName();
string[] lines =
{
"Filename Type Size Used Priority",
"/dev/sda6 partition 999420 56320 -2",
"/dev/sdb7 partition 999420 56320 -2"
};
System.IO.File.WriteAllLines(fileName, lines);
var swap = KernelVirtualFileSystemUtils.ReadSwapInformationFromSwapsFile(fileName);
Assert.All(swap, s => Assert.NotNull(s.DeviceName));
}
public static string PosixIsSwappingOnHddInsteadOfSsd()
{
try
{
var swaps = KernelVirtualFileSystemUtils.ReadSwapInformationFromSwapsFile();
if (swaps.Length == 0) // on error return as if no swap problem
{
return(null);
}
string foundRotationalDiskDrive = null;
for (int i = 0; i < swaps.Length; i++)
{
if (swaps[i].IsDeviceSwapFile)
{
continue; // we do not check swap file, only partitions
}
// remove numbers at end of string (i.e.: /dev/sda5 ==> sda)
var disk = _regExRemoveNumbers.Replace(swaps[i].DeviceName, "").Replace("/dev/", "");
var filename = $"/sys/block/{disk}/queue/rotational";
var isHdd = KernelVirtualFileSystemUtils.ReadNumberFromFile(filename);
if (isHdd == -1)
{
return(null);
}
if (isHdd == 1)
{
foundRotationalDiskDrive = filename;
}
else if (isHdd != 0)
{
if (Log.IsOperationsEnabled)
{
Log.Operations($"Got invalid value (not 0 or 1) from {filename} = {isHdd}, assumes this is not a rotational disk");
}
foundRotationalDiskDrive = null;
}
}
string hddSwapsInsteadOfSsd = null;
if (foundRotationalDiskDrive != null)
{
// search if ssd drive is available
HashSet <string> disks = KernelVirtualFileSystemUtils.GetAllDisksFromPartitionsFile();
foreach (var disk in disks)
{
var filename = $"/sys/block/{disk}/queue/rotational";
var isHdd = KernelVirtualFileSystemUtils.ReadNumberFromFile(filename);
if (isHdd == 0)
{
hddSwapsInsteadOfSsd = disk;
break;
}
}
}
return(hddSwapsInsteadOfSsd);
}
catch (Exception ex)
{
Log.Info("Error while trying to determine if hdd swaps instead of ssd on linux, ignoring this check and assuming no hddswap", ex);
// ignore
return(null);
}
}
public void WriteAndReadPageUsingCryptoPager_WhenCall_AllResultShouldBeNotNull()
{
var swap = KernelVirtualFileSystemUtils.ReadSwapInformationFromSwapsFile();
Assert.All(swap, s => Assert.NotNull(s.DeviceName));
}
public static string PosixIsSwappingOnHddInsteadOfSsd()
{
try
{
var swaps = KernelVirtualFileSystemUtils.ReadSwapInformationFromSwapsFile();
if (swaps.Length == 0) // on error return as if no swap problem
{
return(null);
}
const string sysBlockDirectoryPath = "/sys/block/";
var blocks = Directory
.GetDirectories(sysBlockDirectoryPath)
.Select(x => x.Substring(sysBlockDirectoryPath.Length))
.Where(x => x.StartsWith("loop") == false)
.ToList();
if (blocks.Count == 0)
{
return(null);
}
string foundRotationalDiskDrive = null;
for (int i = 0; i < swaps.Length; i++)
{
if (swaps[i].IsDeviceSwapFile)
{
continue; // we do not check swap file, only partitions
}
if (TryFindDisk(swaps[i].DeviceName, out var disk) == false)
{
continue;
}
var filename = $"/sys/block/{disk}/queue/rotational";
if (File.Exists(filename) == false)
{
continue;
}
var isHdd = KernelVirtualFileSystemUtils.ReadNumberFromFile(filename);
if (isHdd == -1)
{
return(null);
}
if (isHdd == 1)
{
foundRotationalDiskDrive = filename;
}
else if (isHdd != 0)
{
if (Log.IsOperationsEnabled)
{
Log.Operations($"Got invalid value (not 0 or 1) from {filename} = {isHdd}, assumes this is not a rotational disk");
}
foundRotationalDiskDrive = null;
}
}
string hddSwapsInsteadOfSsd = null;
if (foundRotationalDiskDrive != null)
{
// search if ssd drive is available
foreach (var partitionDisk in KernelVirtualFileSystemUtils.GetAllDisksFromPartitionsFile())
{
//ignore ramdisks (ram0..ram15 etc)
if (partitionDisk.StartsWith("ram", StringComparison.OrdinalIgnoreCase))
{
continue;
}
if (TryFindDisk(partitionDisk, out var disk) == false)
{
continue;
}
var filename = $"/sys/block/{disk}/queue/rotational";
if (File.Exists(filename) == false)
{
continue;
}
var isHdd = KernelVirtualFileSystemUtils.ReadNumberFromFile(filename);
if (isHdd == 0)
{
hddSwapsInsteadOfSsd = disk;
break;
}
}
}
return(hddSwapsInsteadOfSsd);
bool TryFindDisk(string deviceName, out string disk)
{
disk = null;
if (string.IsNullOrWhiteSpace(deviceName))
{
return(false);
}
deviceName = deviceName.Replace("/dev/", string.Empty);
foreach (var block in blocks)
{
if (deviceName.Contains(block))
{
disk = block;
return(true);
}
}
return(false);
}
}
catch (Exception ex)
{
Log.Info("Error while trying to determine if hdd swaps instead of ssd on linux, ignoring this check and assuming no hddswap", ex);
// ignore
return(null);
}
}